Getting an Error on Plugin Install

I'm receiving the following error when I try and install plugins (I tried with several) on only one of my sites, using the WPMU DEV Dashboard plugin. All of my other sites were able to install a new plugin without a problem.

One thing I noticed is that, when I added WPMU DEV Dashboard to this new site, it took quite a while to install. Far longer than usual. I don't know if this caused a problem or not, but it's obviously not working.

`Thanks Vaughan. I deactivated and deleted the plugin. Uploaded it and reactivated it with no difference in outcome.

Two questions for things I can try.

1 - What directory are plugins downloaded to through the WPMU DEV Dashboard plugin? I'll doublecheck permissions on that. You can see above the permissions I have recursively set on the uploads directory.

2 - I have this plugin installed on other sites with all the same plugins. I doubt that's the problem. One thing I do wonder about though is if the plugin was only partially installed. What tables and database entries get added on install? I can delete those along with deactivating and deleting the plugin files for a completely fresh install.

Yeah, I'm not sure why WPMU DEV Dashboard would have permissions problems when Wordpress core is able to download plugins and install them from the repository, all from within Wordpress and without me manually FTPing the files up.

Also, Vaughan, I do still wonder if something happened during the install. Like I said, it took abnormally long. Can you send me a list of the database tables and wp_options that are created? I'll remove them, then reinstall.

The database itself wouldn't give these errors, they are definitely issues with the server & not the DB. This plugin doesn't actually create any tables at all, it just saves it's options in the wp_options table.

Can you try uninstalling the plugin, then download the latest version of the plugin to your desktop.

Unzip the package on your desktop.

Then using FTP, make sure you fully remove the wpmudev-uipdater folder from your wp-content/plugins folder.

Then using FTP, upload the wpmudev-updater folder you just downloaded and unzipped to your wp-content/plugins folder.

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